Filter cartridge



FIG. 1 is a front elevational view of a filter cartridge embodying my new design.

FIG. 2 is a rear elevational view thereof.

FIG. 3 is a bottom view thereof.

FIG. 4 is a top view thereof.

FIG. 5 is a left side elevational view thereof, the right side being a mirror image of the left side shown. 

The ornamental design for a filter cartridge, as shown and described. 